U.S. patent number 3,596,952 [Application Number 05/037,579] was granted by the patent office on 1971-08-03 for latch assembly.
This patent grant is currently assigned to Shur-Lok Corp.. Invention is credited to David E. Hall, Ewan M. Hinkle.
United States Patent |
3,596,952 |
Hinkle , et al. |
August 3, 1971 |
LATCH ASSEMBLY
Abstract
A slide button actuates a bellcrank or pair of bellcranks which
in turn latch or latches by converting the linear motion of the
slide button to rotary motion and transmitting this motion through
connecting rods to the latch or latches. The button, its housing,
the bellcranks and rods are embodied in a planar assembly which can
be quite thin for maximum concealment in a door panel or the
like.
Inventors: |
Hinkle; Ewan M. (Laguna Niguel,
CA), Hall; David E. (Costa Mesa, CA) |
Assignee: |
Shur-Lok Corp., (Santa Ana,
CA)
|
Family
ID: |
21895100 |
Appl.
No.: |
05/037,579 |
Filed: |
May 15, 1970 |
Current U.S.
Class: |
292/27; 292/29;
292/124; 292/DIG.37; 292/30; 292/127 |
Current CPC
Class: |
E05C
9/08 (20130101); Y10S 292/37 (20130101); Y10T
292/0832 (20150401); Y10T 292/0829 (20150401); Y10T
292/0831 (20150401); Y10T 292/093 (20150401); Y10T
292/0933 (20150401) |
Current International
Class: |
E05C
9/08 (20060101); E05C 9/00 (20060101); E05c
009/08 (); E05c 009/14 () |
Field of
Search: |
;292/25--27,29--30,92--93,95--98,100,121--124,126--127,221,DIG.34,DIG.37
;70/69,71,76 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Wolfe; Robert L.
Claims
I claim:
1. In a latch assembly:
an actuator comprising a housing defining a slide chamber for an
actuator button movable on a slide axis;
a bellcrank journaled in a side of said housing on an axis
transverse to said slide axis, said bellcrank having a crankpin
projecting into said slide chamber;
an actuator button slidable in said chamber on said slide axis and
having a laterally opening cam slot in which said crankpin is
slidably received, said slot being inclined with reference to said
slide axis so as to impart to said bellcrank arcuate swinging
movement:
a latch unit comprising a support and latch hook carried thereby
for arcuate swinging movement; and
an actuator rod coupled to said bellcrank and to said latch hook at
its respective ends for transmitting rotary movement from said
bellcrank to said latch hook in response to sliding actuation of
said button.
2. A latch assembly as defined in claim 1;
said actuator housing being relatively shallow and flat and
disposed in a common plane with said actuator rod.
3. A latch assembly as defined in claim 2, wherein said bellcrank
and latch hook have opposed, aligned sockets in which respective
ends of said actuator rod are drivingly coupled.
4. A latch assembly as defined in claim 1, wherein said bellcrank
is one of two bellcranks arranged symmetrically at opposite sides
of said actuator unit and both connected to said button for
rotation in a common direction;
there being two of said latch units disposed at respective sides of
said actuator unit, and two of said actuator rods connecting them
to respective bellcranks in a common plane.
5. A latch assembly as defined in claim 1;
said housing embodying a pair of bosses at respective sides
thereof, said bosses being laterally spaced to define a slide
opening;
said housing having a centrally disposed guide boss of bar form
disposed along said slide axis and in opposed relation to said
slide opening;
said button including a bifurcated slide body comprising a pair of
slide fingers separated by a median slot slidably receiving said
guide boss and a stem of reduced width in opposed aligned relation
to said slot, said stem being slidably extended through said slide
opening for operator engagement.
6. A latch assembly as defined in claim 5; including
a pair of springs compressively engaged between the respective
slide fingers and an opposed marginal frame portion of said
housing.
7. A latch assembly as defined in claim 1;
said housing embodying a marginal frame including a longitudinal
top portion and respective side portions;
bearing bosses integral with said side portions and extending
laterally outwardly therefrom on a common longitudinal axis;
said bellcrank being one of two bellcranks having respective
trunnions journaled in the respective bearing bosses, both of said
bellcranks being connected to said actuator button for simultaneous
rotation in a common direction;
there being two of said latch units disposed at respective sides of
said actuator unit and two of said actuator rods connecting them to
respective bellcranks in a common plane.
Description
OBJECTS OF THE INVENTION
The invention has as its object to provide a latch assembly:
1. Which transfers linear motion to rotary motion with a minimal
wear factor and concurrently is inexpensive with a high reliability
factor.
2. Which transfers linear motion to rotary motion by means of a
bellcrank assembly in which the projection of the bellcrank rides
on an inclined plane in the handle assembly.
3. Through which a reverse actuation of the latch assembly, i.e.,
pressure of the latch against the latch keeper, provides a positive
actuation of the handle, thus indicating that definite latching has
taken place.
4. Which, through its simplicity, is lightweight, easily
maintained, and simple to repair.
5. In which both latches are connected in a positive mechanical
manner whereby motion on either end of the assembly will create a
reaction through the operating handle.
6. Which inherently is adjustable for various widths of closures
utilizing the same basic components.
7. Which is designed so that it may be used as a double or single
latch system.
8. Which, due to its compactness, may be installed in a very thin
structure and can be completely obscure except for the actuating
handle and latches.
DESCRIPTION
These and other objects will become apparent in the following
description and appended drawing, in which:
FIG. 1 is a fragmentary plan view of a latch assembly embodying the
invention;
FIG. 2 is an end view of the same;
FIG. 3 is a fragmentary front elevational view of the same;
FIG. 4 is a rear elevational view of the actuator button, housing
and bellcrank assembly;
FIG. 5 is a vertical cross-sectional view taken on line 5-5 of FIG.
4;
FIG. 6 is an end view of the same;
FIG. 7 is a rear elevational view of one of the latch units;
and
FIG. 8 is a vertical sectional view of the same.
Referring now to the drawing in detail, and in particular to FIGS.
1--3, I have shown therein, as an example of one form in which the
invention may be embodied, a dual latch assembly comprising, in
general, an actuator unit A, a pair of latch units B, B on
respective sides thereof, a pair of actuator rods C, C extending
from respective sides of actuator unit A to the respective latch
units B and a pair of keepers D arranged to be engaged by the
respective latch units B. Units A and B are relatively thin and
flat in a common plane and the assembly of actuator and latch units
and shaft is a relatively thin, planar assembly which can be
largely concealed in a door panel, cover or the like. Keepers D are
adapted to be attached to respective sides of a doorway or other
frame structure in which the door or other closure member
incorporating the latch-actuator assembly is framed. As best shown
in FIG. 1, the latches B project from the plane of the actuator
assembly, and the keepers D are disposed at right angles to that
plane. The entire assembly is readily adapted to closures of
varying widths by selecting rods C of appropriate length. In some
installations, one of the latch units B and its shaft C and keeper
D may be omitted, and only a single latch and keeper utilized.
Actuator unit A (FIGS. 4--6) comprises a housing including a frame
portion 10 of rectangular arch form, open at the bottom, a marginal
flange 11 of corresponding form, a pair of bearing bosses 12
extending outwardly from respective sides of frame portion 10, a
central vertical guide boss 13, of bar form, extending downwardly
from the top of frame portion 10, and a pair of cover-attachment
bosses 14 extending inwardly from the lower ends of the sides of
frame portion 10. Bosses 13 and 14 are recessed slightly below the
plane of the rear face of flange 11, to receive a cover plate 15
which is attached to the bosses by means of screws 16. This
provides in the housing a planar rear face which can be fitted to
the surface of a door panel skin (not shown) to which the housing
can be attached by screws or the like extended through fastener
openings 17 in the flange 11.
The unit A includes an actuator button comprising a slide body of
bifurcated flat slab form having a central slot 21 separating a
pair of opposed slide fingers 22 which embrace the guide boss 13 to
guide the button in vertical sliding movement in the housing. The
button has a stem 23 which projects downwardly through a slide
opening defined between the bosses 14 (thereby assisting in the
guiding function) and through the open bottom of the housing, for
engagement by an operator's fingers. The button is normally
maintained in a retracted position by a pair of coil springs 24
positioned in sockets 25 in slide fingers 22 and compressively
engaged against the top member of frame portion 10. In the
retracted position (shown in FIG. 4) the fingers 22 are spaced from
the top of the frame portion to allow for upward movement
(yieldingly opposed by springs 24) to effect actuation of the
latches.
In the outer sides of fingers 22 are diagonal cam slots 27 which
are inclined at angles in the range of 40.degree.--50.degree. to
the plane of sliding movement of the button, an optimum angle being
45.degree., which provides maximum effectiveness of reversible
action.
The bosses 12 are provided with bearing bores 29, aligned on a
common axis in the plane of the actuator assembly. In the bores 29
are journaled the trunnions 30 of bellcranks having crank arms 31
and crankpins 32, the latter being received in respective cam slots
27. In the normal retracted position of the actuator button, the
crankpins 32 are disposed near the upper ends of slots 27, adjacent
the rear side of the housing. Upon upward movement of the actuator
button, the pins 32 will be moved toward the front side of the
housing as indicated by the arrow in FIG. 5, thus rocking the
bellcranks in that direction. Upon releasing the button it will be
returned to its retracted position by its spring loading, and the
bellcranks will be rocked in the opposite direction.
Trunnions 30 are provided with squared sockets 35 in which are
received squared shanks 36 of actuator rods C, of which the body
shafts 37 may be of tubing. At their outer ends the rods C have
squared tails 38 for attachment to latch units B.
Each latch unit B (FIGS. 3, 7 and 8) comprises a support including
a faceplate 40, a sheath 41, and a bearing boss 42 having a bearing
bore in which is journaled the hub 43 of a latch element having a
latch hook 44. Faceplates 40 have openings for fasteners for
attaching them to the same panel skin or surface to which actuator
housing flange 11 is mounted. Latch hook 44 is integral with and
projects radially from the hub 43 and upon rotation of the hub, it
is rotated from a latched position to an unlatched position. When
the latch hook is at rest, it is in the latching position
projecting from sheath 41 as shown in FIGS. 1, 2 and 8. In this
projected position the latch hook 44 is engageable with a lug 46
projecting laterally from a bracket ear 47 of a respective keeper
D. The bracket ears 47 are attachable to doorframe members 50.
Because of the substantially 45.degree. inclination of the slots
27, the assembly will transfer linear to rotary motion and vice
versa with maximum efficiency and minimum wear, thus achieving a
high reliability factor at minimum cost of production.
The opposed surfaces defining slots 27 function as inclined planes
or ramps for camming action with the crankpins 32.
Back pressure of the latch keeper against the latch will be
transferred through the respective actuator rod and bellcrank to
the actuator button so as to lock the button in the normal
retracted position of FIG. 4, thus indicating positively that
latching has taken place.
The assembly will now be seen to be of such simplicity as to be
lightweight, easily maintained, and simple to repair.
It will also be apparent that the two latches are connected
positively through the actuator rods and the mechanism of actuator
unit A so that motion at either end of the assembly will create a
reaction through the button of actuator unit A.
The assembly can be adjusted to different closure widths by
selecting actuator rods C of varying lengths.
The assembly can be used as a single latch system simply by
eliminating one of the actuator rods and latch units and using only
one of each.
* * * * *